ColE1 vectors for direct selection of cells carrying a hybrid plasmid.

Abstract:

:pKY2289, a ColE1::Tn3 derivative, useful for direct selection of cells carrying a hybrid plasmid, was deleted of its mobility functions and parts of the transposon including the left inverted repeat. This deletion mutant, named pKY2700 expresses low levels of colicin E1 synthesis even in recA cells. A nitrosoguanidine mutant of pKY2289 which shows a high level of constitutive colicin E1 synthesis was also deleted of the same sequences as pKY2700. The second plasmid, named pKY2800, has the same molecular weight (3.8 megadaltons) and almost the same structure as pKY2700, but produces colicin E1 at much higher levels and has a copy number 10 times higher. pKY2800 requires no colicin E1 induction for the direct selection of hybrid clones, while pKY2700 requires mitonmycin C at a concentration of 10 ng per ml. These two colE1 derivatives are useful as safe and convenient vectors for cloning DNA fragments at the cleavage sites of EcoRI, XmaI, and SstII of plasmid.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Ozaki LS,Kimura A,Shimada K,Takagi Y

doi

10.1093/oxfordjournals.jbchem.a133798

subject

Has Abstract

pub_date

1982-04-01 00:00:00

pages

1155-62

issue

4

eissn

0021-924X

issn

1756-2651

journal_volume

91

pub_type

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